National Weather Summary for Wednesday, August 30, 2017
by David Moran, on Aug 30, 2017 11:11:48 AM
Tropical storm conditions will continue for portions of the Gulf of Mexico on Wednesday as Harvey moves inland. Excessive rainfall will continue from East Texas into the Mississippi Valley as Harvey moves northeastward Wednesday.
- Tropical Storm Conditions and Excessive Rainfall Continue Wednesday across the Gulf of Mexico and Southeast
- Excessive Rainfall for the Southeast on Thursday
- Potential for Excessive Rainfall Friday from the Tennessee Valley to the Mid Atlantic
- Thunderstorms for the Northern Plains Friday
- Tropical Update
Tropical Storm Conditions and Excessive Rainfall Continue Wednesday across the Gulf of Mexico and Southeast
Tropical Storm Harvey has moved onshore and is forecast to weaken throughout the day on Wednesday while continuing to move to the north-northeast. In the wake of Harvey, winds of 20-25 knots with gusts in excess of 35 knots and seas of 7-9 feet are forecast across portions of the western Gulf of Mexico. For central portions of the Gulf of Mexico, winds of 25-35 knots with gusts in excess of 45 knots are expected. Seas of 9-14 feet are forecast through early Thursday morning. Squalls and waterspouts are also forecast.
Feeder bands are continuing to lift northward across portions of Louisiana, Mississippi, and Alabama. A few supercells may have the potential to produce isolated tornadoes. In addition, these storms may produce heavy rain and wind gusts in excess of 50 mph. In addition, excessive rainfall will continue from portions of Louisiana eastward into Georgia. The flash flooding risk will be highest from western Louisiana to western Tennessee where rainfall totals of 8-12 inches are forecast. From eastern Texas into western Mississippi, rainfall totals of 4-6 inches are forecast, but some isolated areas may pick up as much as 12 inches. Elsewhere, amounts of 2-5 inches are generally expected.
Update 11:43pm CDT: Tornado Warning in SE Mississippi.
Radar 11:43pm CDT
Update 11:51pm CDT: Tornado reported over Gautier, MS.
Radar 11:51am CDT
Update 11:57am CDT: Tornado reported near Hattiesburg, MS.
Radar 11:57am CDT
Update 12:51pm CDT: Tornado Watch extended into southwestern Alabama.
Major Cities in Region: Baton Rouge, LA, Memphis, TN, Jackson, MS, New Orleans, LA, Mobile, AL, Nashville, TN, Birmingham, AL, Atlanta, GA, Knoxville, TN, Charlotte, NC
Excessive Rainfall for the Southeast on Thursday
Texas will finally begin to dry out on Thursday. However, torrential rainfall will persist across the Southeast on Thursday. The greatest threat for flash flooding will be across northern Mississippi, Alabama, Tennessee, and Kentucky. Widespread rainfall amounts of 3-5 inches are likely with isolated higher amounts in excess of 6-8 inches. A lower end risk of excessive rainfall will extend farther southward toward the central Gulf Coast and eastward into the Carolinas and Virginia. Additionally, a few strong thunderstorms may develop with damaging winds and isolated tornadoes the primary hazards.
Major Cities in Region: Little Rock, AR, Memphis, TN, Jackson, MS, Mobile, AL, Atlanta, GA, Knoxville, TN, Raleigh, NC
Excessive Rainfall Risk Outline for Thursday
Potential for Excessive Rainfall Friday from the Tennessee Valley to the Mid Atlantic
The remnants of Harvey will continue to weaken while moving northeast across the Tennessee Valley and Mid Atlantic on Friday. However, moderate to heavy rainfall will still be possible near and east of the area of low pressure. Rainfall totals of 1-3 inches with locally higher amounts in excess of 5 inches are expected.
Major Cities in Region: Nashville, TN, Atlanta, GA, Knoxville, TN, Raleigh, NC, Washington, DC
Excessive Rainfall Risk Outline for Friday
Thunderstorms for the Northern Plains Friday
An upper level trough and cold front approaching from the west may generate a few strong to severe thunderstorms across the Northern Plains on Friday. Gusty winds in excess of 40 mph and small hail will be the primary hazards with these storms.
Major Cities in Region: Pierre, SD, Sioux Falls, SD, Omaha, NE, International Falls, MN, Minneapolis, MN
Severe Thunderstorm Risk Area for Friday
Tropical Storm Harvey (green oval) is moving toward the north-northeast at 8 mph and this general motion is expected to continue through Thursday. A turn toward the northeast is expected Thursday night and Friday. On the forecast track, the center of Harvey should move through southwestern and central Louisiana today and tonight. It will then move through northeastern Louisiana and northwestern Mississippi Thursday and Thursday night. Maximum sustained winds are near 45 mph with higher gusts. Weakening is forecast over the next 48 hours as Harvey moves further inland, becoming a tropical depression tonight.
Tropical Storm Irma (red oval) has developed and is located 420 miles west of the Cabo Verde Islands. Irma is moving toward the west at 13 mph. This general motion is expected to continue for the next couple of days. Some strengthening is forecast during the next 48 hours and Irma could become a hurricane on Friday.
Tropical Enhanced Infrared Satellite
A Look Ahead
The remnants of Harvey will move into the Northeast on Saturday. While the intensity of the showers is to expected to have decreased by this time, rainfall amounts of 1-3 inches with locally higher amounts are expected.
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